US2744773A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Seal
Assignee: Northrop Grumman Space and Mission Systems Corp
•
Filing: 1951-03-23
•
Granted: 1956-05-08
•
Expires: 1971-03-23
Abstract
No abstract record available.
Inventors
- 👤 Cliborn Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:54
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/26; F16J15/30
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
144 words
A DOUBLE SHAFT SEAL WHICH COMPRISES A CASING, APERTURED END PLATES IN SAID CASING, AN APERTURED CENTRAL PLATE IN SAID CASING BETWEEN SAID END PLATES, SPACER SLEEVES IN SAID CASING BETWEEN SAID CENTRAL AND END PLATES AND COACTING THEREWITH DEFINING A PAIR OF CHAMBERS IN THE CASING, A ROTATING SEAL RING ASSEMBLY IN EACH CHAMBER, EACH SEAL ASSEMBLY INCLUDING SPLIT CARBON PACKING RINGS, OPPOSED INNER SPLIT CARBON SEALING RINGS BETWEEN SAID PACKING RINGS, RIBS ON ADJACENT FACES OF THE INNER CARBON SEALING RINGS, A METAL SPRING RING BETWEEN THE RIBS OF THE SEALING RINGS, A CLAMPING SLEEVE CONTRACTING THE SPLIT RINGS INTO SEALING ENGAGEMENT WITH A SHAFT TO BE SEALED, AND THE SPRING RING BEING EFFECTIVE TO URGE BOTH PACKING RINGS OF EACH ASSEMBLY THEREOF INTO AXIAL RUBBING SEALING ENGAGEMENT WITH THE ADJACENT FACES OF THE RESPECTIVE CENTRAL AND END PLATES IN THE CASING.
References Cited (Backward Citations)
DE149278C
Cited
US184973A
Cited
US236117A
Cited
US500899A
Cited
US784785A
Cited
US872366A
Cited
US980542A
Cited
FR34133E
Cited
US2264902A
Cited
US2306146A
Cited
US2393779A
Cited
FR949836A
Cited
US2639171A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-08 | 1959-11-07 | 1960-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-08 | 1963-11-07 | 1964-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-08 | 1967-11-07 | 1968-05-08 | $7700.00 | Window Closed / Lapsed |